Glad you got the major issues sorted...
For your voxel tool, by default it only "carves" along the actual polygonal surface.. there are a couple of buttons in the voxel panel labelled "Align to Plane", "Setup Position" and "Init Position" ... those 3 buttons are what controls the "planar carving angle" for the voxel tool...
Its a little hard and unintuitive to explain exactly how they work, basically.. when you turn on the "Init Position" button, you will be presented with a small "grid object" that you can position and rotate however you want.... once you have it where you want.. click "align to plane" and your voxel brush will follow and carve along the plane... the "Setup Position" button is used to alter an already setup grid object
I would suggest having a search and finding some crymod tutorials on the voxel tools for CE2... there are a few things to be aware of when using them though...
1. save save save and save some more.... it will causes editor crashes
2. take regular backups of your map folder while working with voxels, and store it outside the Wars folder structure(this is more my own personal safety thing rather than needed... but when the editor crashes, if you happen to be saving or writing to the level in anyway at the time.. it will screw it up beyond recovery)
3. use them sparingly and try to ensure they can be occluded as much as possible when not inview, as they can become very expensive very quickly. For cave systems, try to enclose them inside Vis-Areas as this allows them to be completely occluded when not inview.
